Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool deletes/unset variables, implying a destructive mutation, but fails to mention critical details like permission requirements, whether deletions are permanent, error handling for non-existent variables, or side effects on the app. This leaves significant gaps in understanding the tool's behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.